Trimming attachment for sewing-machines



N0 Model.) Y

Y W. T. BTARDSLTL.` TRIMMTNG ATTACHMENT TOR SEWING 'MAGHINTS- PatentedApr. 1, 178811.

Will

the edges of both cutters.

A ilNiTEJD STATES PATENT Ormea. l

WILLIAM F. BEARDSLEE, OF BOSTON, MASSACHUSETTS.

`TRlll/HVIING ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 295,896, dated April 1,1884. Application filed September 17, 1883. (No model.)

To a-ZZ whom it may concern:

Beit known that I, WILLIAM F. `Bomans- LEE, of Boston, countyof Suffolk,Stateof Massachusetts, have invented an Improvement in TrimmingAttachments for Sewing-Machines, of which the following description, inconnection with the accompanying drawings, is a specification, likeletters on the drawings representing like parts.

' This invention has for its object the production of mechanism by whichthe edgesof knitted or other fabrics or leather may be trimmed, the saidmechanism being preferably used in connection with sewing-machines ofthe wellknown Villcox 82; Gibbs class, or with other suitable sewingmechanism. i

In this invention I employ a cutting-disk carried bya sleeve, whichsurrounds and forms a bearing for the hook-shaft, and `in connectionwith the said disk I employ asecond disk located above it, theircutting-edges overlapping each other, the contiguous faces of the saiddisks being in substantially a `vertical plane, with theircutting-peripheries close to the needle, in order that the materialbeing sewed may be trimmed parallel with the line of stitching. Thedisks as herein shown are adapted to be moved intermittingly and whilethedmaterial is being fed or moved by the usual fee Figure 1 inelevation represents a portion of a Willcox 8L Gibbs sewing-machine withmy trimming mechanism added; Fig. 2, a modification thereof. Fig. 3 is asection of Fig. l on the dotted line so @showing the usual clothplateand the position of the needle with relation to the cuttingpoint of thecutting-disks,- and Fig. 4 is a diagram in plan, representing theposition of the two shafts of the two cutters with relation to eachother and parts of A, needle-bar a, needle cloth-plate at are and Themachine-head and the said machine in practice will be provided with theusual hook and with a suitable four-motioned feeding device and means tomove it.

Ihe cutting-disk b, located below the clothplate, and having itsperiphery extended up- Ward above the level of the same, is connectedwith a sleeve, b', which is made to inclose the haokshaft a2, and alsoform aibearing for the latter, the shaft turning therein. The sleeve btakes a bearing in the upright part b2 of the frame A, and at its rearend the said sleeve is provided with a gear, b3, which, as shown in Fig.l, meshes with an intermediate, c, on a stud of ahanger, c', and thesaid intermediate is engaged by the gear c?, fast on the shaft c3, whichhas its bearings in a frame, d3 d4, substantially such as represented bylike letters in my application No. 100,971.

A The shaft c3 has fast on it a bevel-gear, c4, which engages abevel-gear, c5, and drives the short inclined shaft c, provided at itsouter end with the upper cutting-disk, d, the edge of which overlaps theedge of the disk b, and, as'herein shown, at its front side.

The shaft c has on it a spring, d', and a nut, d2, which latter may beturned to compress the said spring and draw the cutting-disk d more orless closely against the cutting-disk b, thus keeping the twocutting-disks near their edges pressed together by a spring, which, asthe cutting-disks are rotated, co-operate each to maintain sharp theedge of the other, thus avoiding frequent sharpening.

The hook-shaft a2 has upon it an ecc-entric, or it may be a cam, e,carrier, e', having a pawl, c2, which engages the ratchet e3 fast on androtates the shaft c3 intermittingly, butat a different speed from thatof the said rotating hook-shaft, the movement of the two diskspositively-being at the time when the usual feeding device of thesewing-machine is operating to move the material for a new stitch.

In the modification, Fig. 2, thecuttingdisk d is attached directly tothe prolonged end of the shaft c3, and the said shaft is provided with aspring, d, and nut d2, such as described in Fig. 1 in connection withshaft c6, and for the same purpose. i

In Fig. 2, where the upper disk, d, of the trimmer is placed directly onthe shaft c, the gear c2 on the latter is adapted` to rotate the gear b3and sleeve b and under cutter Z1 intermittingly. By employinggearsinstead of the single pawl and ratchet the disks may be rotatedconstantly.

I am aware that it is not new to employ a which strikes a pawl-,

IOO

rotating eccentric or mutilated disk which cooperates with a slottedsupport or throat; and I ain also aware that two rotating disk-cuttershave been employed to cut oval tips for hats;

5 and so, also, I am aware that oscillating many- 1.o disk isAsubstantially in the same plane as the edge of the said lower disk. Theconcavity in the disk and its inclined position are of especialadvantage, as it forms a space for the reception of the needle-holdingnut or end of I5 the needle-bar, thus permitting the fabric or materialto be trimmed nearer the needle than of the said disks, substantially asdescribed.

3. The rotating hook-shaft a2, provided with would otherwise bepossible.

rPhe shaft c6 in Fig. 1 is shown as inclined downward and backward withrelation to the shaft a2,- but, in addition to such inclination,

the shafts, which directly carry the cuttingdisks described, are soplaced with relation to each other, or inclined, that their axes are notin the same vertical plane, so that the lapping edges of the disks bearagainst each other only at their point of contact, thus forming a reliefback of the actual cutting-point. The rotating shaft ciz gives motion tothe device below the cloth, which is to co-operate with the eyepointedneedle in the formation of the stitch.

In order to bring the trimming mechanism very close to the line of theseam, and yet allow the usual Willcox St Gibbs hook to be employed, Ihave concaved the outer face of the under cutting-disk, b.

In this my apparatus the cutting-edges will preferably be set a littlein advance of the stitching-point, but the material may be cut ortrimmed exactly opposite the side of the 4o needle or a very littlebehind it; but in all cases the cutters in operation on a sewingmachinewill cut the material substantially at the stitch forming point, whichenables a curved or irregular shape to be trimmed substantially parallelwith the seam, which is also curved and irregular; whereas if thedisk-cutters were located several stitches back of the stitching-pointonly a straight edge could be trimmed.

I. In a sewing-machine, the upper rotating cutting-disk, d, combinedwith the cutting-diskv b, having its axis of rotation coincident withthat of the shaft a? and turning on the said shaft, to operatesubstantially as described.

2. The rotating cutting-disk d and the disk b, having its axis ofrotation coincident with that of the shaft a2, the said disks havingtheir cutting-edges placed close to and substantially opposite theneedle to trim the material substantially at thestitching-point, andmeans to connect and rotate the said disks in unison, combined with asuitable spring to hold the overlapping edges of the said disks togetherat their cutting-point to effect the sharpening an eccentric or cam, theshaft c3, a pawl and ratchet to actuate the said shaft intermittingly,and the upper rotating disk, d, moved intermittingly by the said shaft,substantially as described, but at a different speed, combined with thedisk b, its/carrying-sleeve having its axis of rotation coincident withthat of. and serving as a bearing for, the hook-shaft, and with means toactuate the said sleeve from the said shaft, to operate all as setforth.

4.. The needle and needle-bar of a sewingmachine combined with atrimming" mechanism having a disk, d, the face of which is concaved andset at an inclination to the line of reciproeation of the needle-bar andneedle, substantially as described.

5. In a sewing-machine, the hook-shaft combined withthe sleeve bthereon,and its attached cutter b, having its outer face concaved forthe reception of part of the hook, substantially as described.

In testimony whereof Ihave signed my name to this specication in thepresence of two subscribing witnesses.

WILLIAM F. BEARDSLEE.

Witnesses:

' G. W. GREGoRY,

B. J. Novus.

